Punch holder for trimming machines



Feb. 5, 1929.

C. T. BRENNAN PUNCH HOLDER FOR TRIMMING MACHINES Filed April 6, 1927 a r7' L Patented Feb. 5, 1929. I

CHAR-LES 'I'. BRENNAN, 0F WATERBURY, CONNECTICUT, AVSSVIGNOR To THE E.JQ MAN- VILLE MACHINE COMPANY, or ooN E TIcur. 7

Application filed April 6,

in patent to Campbell No. 926,170; June 29,

1909, there are gates which are reciprocated by cranks or eccentrics andwhich carry swagmg, v'perforatmg or shear ng punches.

v The object of the presentinvention is to provide a. constructionwhereby the punch and punch holding means of such machines may be asa'unit quickly appliedto or removed from the reciprocating gates, and

thereby reduce the expense of manufacture and facilitate assembly andchange when 1L is desired to use a difierentpunch.

In attaining this object the body of the punch holder is madecylindrical with two opposite sides fiattened, The reciprocating gatehas a cylindrical bore of adiameter that will receive the cylindricalbody of the punch holder and has aslot cut through its topto the bore,which slot is of a width equal to the minimum diameter of the bodyof thepunch holder; whereby the punch holder. may be passed edgewise throughthe slot into the bore and given a quarter turn to a position in whichit will be retained in the bore. The forward end of the punch holderhasa head with slots that when the punch holder is in operative positionin the gate fitclamping studs, bolts ors'crews which when tightened lockthe punch holder from turning. The studs and head of the punch holdertie together the sections of the gate which are separated by the boreand slot so that they will not spring apart under the force of the blowsof the punch when it strikes.

In the accompanying drawings Fig.1 is a plan of the forward end of thereciprocating gate of a trimming machine with the punch holder andpuncharranged according to this invention. Fig. 2 is a front elevation of thesame. Fig. 3 is a vertical section on the plane indicated by the dottedline 3-3 on Fig. 2. Fig. 4 is a rear view of the punch holder.

The gate 1 has the usual well known outline of those found inmachines'of the type referred to. The front end of the gate has alongitudinal bore 2 that is circular in cross section and has a slot 3cut through the top of-the gate to. the bore, which slot is less in-Width than the diameter of the bore. Screwed WATERBURY CoNNEcTICUnEACORPORATION or" PUNCH HOLDER FOB TRIMMING MAcI-iiiins;

192a SerialNo. 181,335. I

into the ham end of. the gate are studs};

vided with nuts 5. i a

The body 6 ofthe punch holder is generally circular in. cross sectionand of a diameter that will closely fit the bore in the gate. 7 On twoopposite sides the body of the punch holder is flattened, as at 7, toreduce its diameterfrom flat to flat to a'dimension which willpermit1the holder to be passed "through theslot intojfth'e boreinthegate. At the forward fend of the punch holder is a head 8 whichextends transversely and is provided with slots 9 'thatjwhen the punchholderi's rotated turn on to or from the studs set in the endofthejgate'j.

The'punch holder has a longitiudinalbore 10 that at the front end issmooth for receiving a punchllf and at the'rear end is threaded forreceiving the plug 12thatis screwed against the inne'r end ofthepuncli'.

Thisplug has a head 13by' means of'fwhich itmay be convenientlyturned,fand a nut 14 that when't'urned up against the gate'causes thegateto be clamped between the head of the holder: and the nut. When thenutjld is loosened the plugmay' beused to force the punchfrom'the boreof the holder.

In a'ssemblingthis structure the holder is turned edgewise and passedthrough the slot into the bore and given a quarter turn," after whichthe nut 14 at the rear and the nuts 5 at the front aretightened. In thiscondition the holder is solidly secured in the gate. When the nut 14 andthe nutsfyare loosened v the puncliholder may be given aquart'er turnand then removed from the gate. It is a very simple matter to loosen thenuts and remove the punch holder, and when thepunch holder is inposition and the nuts are tightened the head of the holder fitting thestud ties together the divided section of the gate so that it will notyield when a blow isstruck by the punch.

The invention claimed is:

l. A punch holding means for metal trimming machine comprising a gatehaving a longitudinal bore of one. diameter and an opening thereto ofless width than the diameter of the bore, a punch holder having a bodywith a maximum diameter that fits said bore and a minimum diameter lessthan the width of said opening whereby the body iof the holder may bepassedthrough the said opening into and out of the bore, and when in thebore may be turned to prevent its withdrawal or to permit its'removal.

2. A punch holding means for metal trimming machinecomprising a gatehaving a longitudinal bore of one diameter and an opening thereto ofless width than the diameter of the bore, a punch holder having a bodyWith a maximum diameter that fits said bore and a minimum diameter lessthan the Width of said opening whereby the body a of the holder mayberpassed through the said opening into and out of the bore, and when inthe bore may be turned to prevent its Withdravval or to permit itsremoval, said holder having a head of greater Width than the diameter ofthe bore,'and means'for fastening the head to the gate andlocking'the'holder be passed transversely through the said opening into,and out of thebore andvvhen in the bore turned to prevent its Withdrawalor to permit its" removal, and means for fastening the punch holder tothe gate to prevent the punch holder from turning in the bore.-

14:. A punch holding means for metal trimming machine comprising agatehaving a longitudinal bore of one diameter and an opening thereto ofless vvidth than the diameter of the bore, studs extending from thefront end of said gate, a punch holder having a body With a maximumdiameter that fits said bore and a minimum diameter less than V theWidth of said opening whereby the body of the holder maybe passedthrough the said opening into and out of the bore, said holder having aheadiivith slots that receive'said studs for; fastening the head to thegate and locking the holder, from turning in the bore.

the gate.

5. A punch holding means for metal trimming machine comprising a gatehaving a longitudinal bore of one diameter and an opening thereto ofless Width than the diameter of the bore, a punch holder having a bodyWith a maximum diameter that fits saidbore and a minimum diameterlessthan the Width ofsaid opening Wherebythe body 01 the holder may bepassed through the said opening into and'out of the bore, and When inthe bore may be turned to prevent its Withdrawal or to permitits/removal, said holder having an'opening at its front end forreceiving a punch, and a plug threaded into its rear end. 1

A punchholding means for metal trim-. mmg machine comprising a gatehaving a longitudinal bore of one diameter and an opening thereto'ofless Width thanythe diameter of the bore a punch holder having a bodywith a maximum'diameter that fits said bore and a minimum diameter lessthan the WlClt-liOf said opening whereby the body or the holder may bepassed through the said opening into and out of the bore, and when inthe bore may be turnedto'p'revent its Withdrawal or to permit itsremoval, said holder having a head at its trontend and a plug threadedinto its rear end With anut on said plug and adapted to in connectionWith the head fasten'the holder in the gate. l f

7, The combination of a'reciprocatorygate having a longitudinal openingof tvvo'dif- 'terent Widths and a punch holder having a head and a bodyof two different Widths, the maximum Width of the holder body fittingthe maximum diameter of the opening in the gate and the minimum Width ofthe holder body capable of passing through the lesser opening in thegate, vvhereby the holder in one position may be passed into and out ofthe gate, andivhen in the gate may be turned to prevent 7 itsWithdravval therefrom, and means for locking the holder from turning inCHARLES T. BRENNAN.

